[llvm] [dsymutil] Add option to copy swiftmodules built from interface (PR #165293)

[Roy Shi via llvm-commits]

royitaqi wrote:

@adrian-prantl Could you kindly review this patch? It adds an option to skip the logic you added in 96f95c9. Default behavior doesn't change.

https://github.com/llvm/llvm-project/pull/165293